CN111395314A - CFG pile composite foundation construction method - Google Patents
CFG pile composite foundation construction method Download PDFInfo
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- CN111395314A CN111395314A CN202010228848.5A CN202010228848A CN111395314A CN 111395314 A CN111395314 A CN 111395314A CN 202010228848 A CN202010228848 A CN 202010228848A CN 111395314 A CN111395314 A CN 111395314A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
A CFG pile composite foundation construction method comprises the following steps of S1, pile point arrangement: digging a foundation pit according to a construction drawing; compacting and flattening the foundation soil layer at the bottom of the foundation pit; fixing a bottom plate at the bottom of the positioning piece on the foundation soil layer according to a construction drawing, and ensuring that the bottom plate is in a horizontal state, wherein the shaping pipe vertically arranged on the surface of the bottom plate is a reserved pile drilling point; s2, drilling and pile making: s3, backfilling the first soil sealing layer: s4, pile cap building: s5, paving filler; according to the invention, by digging the foundation pit and backfilling for multiple times, the purpose that the soil between piles is not required to be cleaned again and only backfilling is required can be realized; the working space can be increased, the digging and backfilling can be completed quickly through the excavator, and the construction efficiency is remarkably improved compared with that of a traditional method; the shaping pipe can enable the pile body to be poured into the required pile top height at one time, cutting operation is not needed, and safety and construction efficiency are improved; the fixed part can be used as a calibration reference part, so that a worker can visually see the drilling position of the auger stem.
Description
Technical Field
The invention belongs to the technical field of CFG pile construction, and particularly relates to a CFG pile composite foundation construction method.
Background
The CFG pile is a cement fly ash gravel pile, which is a variable-strength pile with certain strength and is prepared by mixing gravel, stone chips, sand and fly ash with cement and adding water and mixing the mixture by various pile forming machines. The CFG pile is a low-strength concrete pile, can fully utilize the combined action of the bearing capacity of the soil among the piles, can transmit load to a deep foundation and has better technical performance and economic effect;
the main construction sequence of the existing CFG pile composite foundation is as follows: measuring and lofting, positioning a drilling machine, drilling and forming holes, pouring and pulling a mixture, cleaning soil among piles, building a pile cap, backfilling the soil among the piles, and paving a filler;
according to the construction method, the initial building height of the pile body exceeds the preset height of the pile top, so that soil between piles needs to be cleaned, the top of each pile body is exposed to the required height, and then a cutter is manually used for cutting off the excessive part of the pile body; in the whole process of cleaning the soil between the piles, the digging depth is not easy to be controlled, the operation space between the piles is limited, and the cleaning construction is time-consuming and labor-consuming; during subsequent cutting operation, the situation that people are injured by cutting equipment often occurs due to severe collision between the cutting machine and the pile body, and the cut cement column needs to be transferred out of a construction site.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a construction method of a CFG pile composite foundation, which has the following specific technical scheme:
a construction method of a CFG pile composite foundation, comprising the following steps:
s1, pile arrangement:
digging a foundation pit according to a construction drawing;
compacting and flattening the foundation soil layer at the bottom of the foundation pit;
fixing a bottom plate at the bottom of the positioning piece on the foundation soil layer according to a construction drawing, and ensuring that the bottom plate is in a horizontal state, wherein the shaping pipe vertically arranged on the surface of the bottom plate is a reserved pile drilling point;
s2, drilling and pile making:
the bottom end of a spiral drill rod extends into the shaping pipe, the distance between the spiral drill rod and each position of the shaping pipe is measured, and the spiral drill rod is adjusted until the spiral drill rod and the shaping pipe are located at the same center line;
driving the auger stem to rotate downwards, wherein the sizing pipe blocks and positions the auger stem on the outside, and the sizing pipe stops when the auger stem drills the drill hole with the required depth in the foundation soil layer;
conveying the stirred mixture to an inner hole of the spiral drill rod, opening a discharge valve after the inner hole is filled, slowly rotating the spiral drill rod upwards, and discharging the mixture from the bottom end of the spiral drill rod;
stopping conveying the mixture after the auger stem leaves the shaping pipe, wherein the drill hole and the shaping pipe are filled with the mixture;
standing and maintaining for many days, and solidifying the mixed material in the drilling and shaping pipe into a pile body;
s3, backfilling the first soil sealing layer:
disassembling each positioning piece to expose the pile body originally arranged in the shaping pipe;
carrying out performance test on the pile body;
backfilling soil into the foundation pit, leveling and compacting the backfilled soil to form a first soil sealing layer, wherein the top end of the pile body extends out of the first soil sealing layer;
s4, pile cap building:
building a pile cap of a reinforced concrete structure above the pile body, wherein the top end of the pile body is embedded in the pile cap;
s5, laying of fillers:
backfilling soil to the pile caps, sealing each pile cap by the soil, and flattening and compacting the backfilled soil to form a second soil sealing layer;
laying a mattress layer above the second soil sealing layer;
and paving roadbed filling above the mattress layer.
Further, the specific method for measuring the distance between the auger stem and each position of the sizing pipe comprises the following steps: the workman is in get three measuring point on the calibrator, the measuring point is triangle-shaped and distributes, uses slide caliper to measure auger stem with distance between the calibrator, then compare three measured data, thereby confirm auger stem's deviation in position.
Further, the stirring preparation method of the mixture comprises the following steps: stirring the mixture according to the test mixture ratio, wherein the feeding sequence is as follows: firstly, filling broken stone or pebble, then adding cement, fly ash and an additive, finally adding sand, uniformly stirring, and putting into a stirring barrel; the stirring time of each batch is not less than 60s, and the concrete slump is controlled to be 160-200 mm.
Further, fixing the bottom plate at the bottom of the positioning piece on the foundation soil layer specifically comprises: fixing the bottom plate on a foundation soil layer by using a positioning rivet, so that each shaping pipe is accurately placed on a preset pile drilling point; measuring the levelness of the bottom plate by using a horizontal measuring instrument, and continuously adjusting the bottom plate until the bottom plate is in a horizontal state; and after the installation is finished, smearing a cement release agent with the thickness of 2mm on the inner wall of the shaping pipe.
Further, the performance test of the pile body specifically comprises: and after the pile body is formed for 28 days, detecting the integrity and continuity of the pile body by adopting low strain force, and detecting the bearing capacity of the composite foundation by adopting a single-pile load test.
The invention has the beneficial effects that:
1. by adopting the mode of digging the foundation pit and backfilling for multiple times, the purpose that the soil between piles is not required to be cleaned and only backfilling is required can be realized; the working space can be increased, the digging and backfilling can be completed quickly through the excavator, and the construction efficiency is remarkably improved compared with that of a traditional method;
2. the shaping pipe can enable the pile body to be poured into the required pile top height at one time, cutting operation is not needed, and safety and construction efficiency are improved;
3. the fixed part can be used as a calibration reference part, so that workers can visually see the drilling position of the auger stem; the spiral drill rod completes primary adjustment when entering the shaping pipe, then the distance between the shaping pipe and the spiral drill rod is measured, and secondary adjustment is carried out on the spiral drill rod, so that the spiral drill rod is greatly ensured to be in a vertical state;
4. the design pipe can block restraint auger stem from the outside, avoids auger stem to rock the straightness that hangs down that influences drilling.
5. The shaping piece can be assembled and disassembled for repeated use, other procedures cannot be influenced, and the improvement cost of the construction process is low.
Drawings
Fig. 1 shows a schematic view of the installation state of the setting member of the present invention;
FIG. 2 is a schematic view of the overall construction of the positioning member of the present invention;
FIG. 3 shows a schematic view of the drilled pile state of the present invention;
FIG. 4 is a schematic view illustrating the overall structure of a CFG pile composite foundation of the present invention;
shown in the figure: 1. the foundation pit comprises a foundation pit body, 11, a foundation soil layer, 111, a drilling hole, 2, a shaping piece, 21, a bottom plate, 22, a shaping pipe, 23, a positioning rivet, 3, a pile body, 4, a spiral drill rod, 5, a first soil sealing layer, 6, a pile cap, 7, a second soil sealing layer, 8, a mattress cushion layer, 9 and roadbed filling.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A construction method of a CFG pile composite foundation, comprising the following steps:
as shown in fig. 1, S1, pile placement:
digging a foundation pit 1 according to a construction drawing; digging out the foundation pit 1 can ensure that the soil between piles does not need to be cleaned again in the follow-up process, and only backfilling is needed; compared with the traditional process, the method has the advantages that the excavation depth and the backfilling frequency are improved, but the operation space is large each time, the excavation and the backfilling can be completed quickly through the excavator, and the construction efficiency is also obviously improved compared with the traditional method;
compacting and leveling the foundation soil layer 11 at the bottom of the foundation pit 1;
fixing a bottom plate 21 at the bottom of the positioning piece 2 on the foundation soil layer 11 according to a construction drawing, and ensuring that the bottom plate 21 is in a horizontal state, wherein a shaping pipe 22 vertically arranged on the surface of the bottom plate 21 is a reserved pile drilling point; the setting pipe 22 is used as a reference point, so that a drilling machine operator can more conveniently place the auger stem 4 at a pile drilling point, a line drawing method is adopted in the past, and an intersection point in a grid line is the pile drilling point, however, the method is not intuitive, and the auger stem 4 is easy to deviate and easily generate inclined holes in actual operation;
as shown in fig. 3, S2, drilling and pile making:
the bottom end of the spiral drill rod 4 is stretched into the sizing pipe 22, the distance between the spiral drill rod 4 and the sizing pipe 22 at each position is measured, and the spiral drill rod 4 is adjusted until the spiral drill rod 4 and the sizing pipe 22 are located at the same center line; in this step, since the sizing tube 22 is ensured to be in the vertical state, the sizing tube 22 can be used as a calibration reference piece, the sizing tube 22 enables workers to visually see the drilling position of the auger stem 22, the auger stem completes one-time adjustment when entering the sizing tube, then each interval is measured, and the auger stem 4 is adjusted for the second time, so that the auger stem 4 is greatly ensured to be in the vertical state;
driving the auger stem 4 to rotate downwards, wherein the sizing pipe 22 externally blocks and positions the auger stem 4, and stops when the auger stem 4 drills the drill hole 111 with the required depth in the foundation soil layer 11; in the step, the shaping pipe 22 can block and restrain the auger stem 4 from the outside, so that the perpendicularity of the drilled hole is prevented from being influenced by the shaking of the auger stem 4;
conveying the stirred mixture into an inner hole of the spiral drill rod 4, opening a discharge valve after the inner hole is filled, slowly rotating the spiral drill rod 4 upwards, and discharging the mixture from the bottom end of the spiral drill rod 4; the stirring preparation method of the mixture comprises the following steps: stirring the mixture according to the test mixture ratio, wherein the feeding sequence is as follows: firstly, filling broken stone or pebble, then adding cement, fly ash and an additive, finally adding sand, uniformly stirring, and putting into a stirring barrel; stirring time of each batch is not less than 60s, and concrete slump is controlled to be 160-200 mm;
after the auger stem 4 leaves the sizing tube 22, stopping conveying the mixture, and filling the drill hole 111 and the sizing tube 22 with the mixture; in the step, the mixture extending out of the foundation soil layer 111 can be formed in the shaping pipe 22, and the drill holes 111 and the mixture in the shaping pipe 22 can be continuously arranged, so that a part of the formed pile body 3 can extend out of the foundation soil layer 111, and the pile body test can be conveniently carried out; in addition, the required pile top height is poured by the pile body at one time, cutting operation is not needed, and safety and construction efficiency are improved;
standing and maintaining for many days, and solidifying the mixed materials in the drilling holes 111 and the shaping pipes 22 into the pile body 3;
as shown in fig. 4, S3, backfilling the first soil sealing layer:
disassembling each positioning piece 2 to expose the pile body 3 originally placed in the sizing pipe 22; after the pile body 3 is solidified and formed, the positioning piece 2 has no purpose and can be detached for recycling;
carrying out performance test on the pile body 3; each pile body 3 needs to be subjected to performance testing to ensure construction quality and prevent collapse caused by insufficient local strength; after the pile body 3 is formed for 28 days, detecting the integrity and continuity of the pile body by adopting low strain force, and detecting the bearing capacity of the composite foundation by adopting a single-pile load test;
backfilling soil into the foundation pit 1, leveling and compacting the backfilled soil to form a first soil sealing layer 5, wherein the top end of the pile body 3 extends out of the first soil sealing layer 5; the first soil sealing layer 5 is used for sealing the overhanging part of the pile body 5 for the first time; the top end of the pile body 3 is also partially extended to facilitate the subsequent construction of the pile cap 6, so that the pile body 3 and the pile cap 6 can be integrated;
s4, pile cap building:
building a pile cap 6 of a reinforced concrete structure above the pile body, wherein the top end of the pile body 3 is embedded in the pile cap 6; the bearing capacity of the pile body 3 can be further improved by building each pile cap 6;
s5, laying of fillers:
backfilling soil to the pile caps 6, sealing each pile cap 6 by the soil, and flattening and compacting the backfilled soil to form a second soil sealing layer 7;
a mattress layer 8 is laid above the second soil sealing layer 7;
and paving roadbed filling 9 above the mattress layer 8.
As an improvement of the above technical solution, the specific method for measuring the distance between the auger stem 4 and the sizing pipe 22 at each position is as follows: a worker takes three measuring points on the shaping pipe 22, the measuring points are distributed in a triangular shape, a vernier caliper is used for measuring the distance between the auger stem and the shaping pipe 22, and then three measuring data are compared, so that the deviation direction of the auger stem 4 is determined; the auger stem 4 can be rapidly adjusted secondarily by a three-point measurement method, so that the auger stem 4 can be accurately in a vertical state.
As an improvement of the above technical solution, the fixing of the bottom plate 21 at the bottom of the positioning element 2 on the foundation soil layer 11 specifically includes: fixing the bottom plate 21 on the foundation soil layer 11 by using a positioning rivet 23, so that each sizing pipe 22 is accurately placed on a preset pile drilling point; measuring the levelness of the bottom plate 21 by using a horizontal measuring instrument, and continuously adjusting the bottom plate 21 until the bottom plate 21 is in a horizontal state; after the installation is finished, a cement release agent with the thickness of 2mm is coated on the inner wall of the shaping pipe 22; the bottom plate 21 can be conveniently mounted and dismounted by adopting the positioning rivets 23, and the release agent is used for conveniently separating the shaping pipe 22 from the pile body 3; the levelness accessible of bottom plate 21 adds native, the mode of pressing is adjusted, and the levelness is adjusted more portably, guarantees the levelness of bottom plate 21 and alright guarantees the straightness that hangs down of sizing pipe 22, and then guarantees that auger stem 4 can vertical drilling, the inclined hole can not appear.
As shown in fig. 2, a plurality of sizing pipes 22 are vertically arranged on the surface of the long strip-shaped bottom plate 21 at equal intervals, the bottom ends of the sizing pipes 22 are flush with the bottom surface of the bottom plate 21, and the height, number, spacing and other numerical values of the sizing pipes 22 can be changed according to the construction standard; both ends of the bottom plate 21 are penetrated with setting rivets 23.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A CFG pile composite foundation construction method is characterized in that: the construction method comprises the following steps:
s1, pile arrangement:
digging a foundation pit according to a construction drawing;
compacting and flattening the foundation soil layer at the bottom of the foundation pit;
fixing a bottom plate at the bottom of the positioning piece on the foundation soil layer according to a construction drawing, and ensuring that the bottom plate is in a horizontal state, wherein the shaping pipe vertically arranged on the surface of the bottom plate is a reserved pile drilling point;
s2, drilling and pile making:
the bottom end of a spiral drill rod extends into the shaping pipe, the distance between the spiral drill rod and each position of the shaping pipe is measured, and the spiral drill rod is adjusted until the spiral drill rod and the shaping pipe are located at the same center line;
driving the auger stem to rotate downwards, wherein the sizing pipe blocks and positions the auger stem on the outside, and the sizing pipe stops when the auger stem drills the drill hole with the required depth in the foundation soil layer;
conveying the stirred mixture to an inner hole of the spiral drill rod, opening a discharge valve after the inner hole is filled, slowly rotating the spiral drill rod upwards, and discharging the mixture from the bottom end of the spiral drill rod;
stopping conveying the mixture after the auger stem leaves the shaping pipe, wherein the drill hole and the shaping pipe are filled with the mixture;
standing and maintaining for many days, and solidifying the mixed material in the drilling and shaping pipe into a pile body;
s3, backfilling the first soil sealing layer:
disassembling each positioning piece to expose the pile body originally arranged in the shaping pipe;
carrying out performance test on the pile body;
backfilling soil into the foundation pit, leveling and compacting the backfilled soil to form a first soil sealing layer, wherein the top end of the pile body extends out of the first soil sealing layer;
s4, pile cap building:
building a pile cap of a reinforced concrete structure above the pile body, wherein the top end of the pile body is embedded in the pile cap;
s5, laying of fillers:
backfilling soil to the pile caps, sealing each pile cap by the soil, and flattening and compacting the backfilled soil to form a second soil sealing layer;
laying a mattress layer above the second soil sealing layer;
and paving roadbed filling above the mattress layer.
2. The CFG pile composite foundation construction method of claim 1, wherein: the specific method for measuring the distance between the auger stem and each position of the sizing pipe comprises the following steps: the workman is in get three measuring point on the calibrator, the measuring point is triangle-shaped and distributes, uses slide caliper to measure auger stem with distance between the calibrator, then compare three measured data, thereby confirm auger stem's deviation in position.
3. The CFG pile composite foundation construction method of claim 1, wherein: the stirring preparation method of the mixture comprises the following steps: stirring the mixture according to the test mixture ratio, wherein the feeding sequence is as follows: firstly, filling broken stone or pebble, then adding cement, fly ash and an additive, finally adding sand, uniformly stirring, and putting into a stirring barrel; the stirring time of each batch is not less than 60s, and the concrete slump is controlled to be 160-200 mm.
4. A CFG pile composite foundation construction method according to claim 1 or 2, characterized in that: fixing the bottom plate at the bottom of the positioning piece on the foundation soil layer specifically comprises the following steps: fixing the bottom plate on a foundation soil layer by using a positioning rivet, so that each shaping pipe is accurately placed on a preset pile drilling point; measuring the levelness of the bottom plate by using a horizontal measuring instrument, and continuously adjusting the bottom plate until the bottom plate is in a horizontal state; and after the installation is finished, smearing a cement release agent with the thickness of 2mm on the inner wall of the shaping pipe.
5. The CFG pile composite foundation construction method of claim 1, wherein: the performance test of the pile body is specifically as follows: and after the pile body is formed for 28 days, detecting the integrity and continuity of the pile body by adopting low strain force, and detecting the bearing capacity of the composite foundation by adopting a single-pile load test.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010228848.5A CN111395314A (en) | 2020-03-27 | 2020-03-27 | CFG pile composite foundation construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010228848.5A CN111395314A (en) | 2020-03-27 | 2020-03-27 | CFG pile composite foundation construction method |
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| CN111395314A true CN111395314A (en) | 2020-07-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111827285A (en) * | 2020-07-24 | 2020-10-27 | 中建四局建设发展有限公司 | Perpendicularity control device for pile planting method and using method thereof |
| CN113494074A (en) * | 2021-07-30 | 2021-10-12 | 中铁七局集团郑州工程有限公司 | Building foundation treatment method for area with liquefied soil bearing layer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106498938A (en) * | 2016-10-26 | 2017-03-15 | 重庆大学 | A kind of cast-in-place concrete pile head shaping equipment and its using method |
| CN109736342A (en) * | 2018-12-28 | 2019-05-10 | 江苏省水利工程科技咨询股份有限公司 | A kind of soil cement mattress layer and its construction method in hydraulic engineering composite foundation |
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2020
- 2020-03-27 CN CN202010228848.5A patent/CN111395314A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106498938A (en) * | 2016-10-26 | 2017-03-15 | 重庆大学 | A kind of cast-in-place concrete pile head shaping equipment and its using method |
| CN109736342A (en) * | 2018-12-28 | 2019-05-10 | 江苏省水利工程科技咨询股份有限公司 | A kind of soil cement mattress layer and its construction method in hydraulic engineering composite foundation |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111827285A (en) * | 2020-07-24 | 2020-10-27 | 中建四局建设发展有限公司 | Perpendicularity control device for pile planting method and using method thereof |
| CN111827285B (en) * | 2020-07-24 | 2022-02-25 | 中建四局建设发展有限公司 | Perpendicularity control device for pile planting method and using method thereof |
| CN113494074A (en) * | 2021-07-30 | 2021-10-12 | 中铁七局集团郑州工程有限公司 | Building foundation treatment method for area with liquefied soil bearing layer |
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Application publication date: 20200710 |